Hubby and I have been renovating our upstairs of our home. When it came time to put drywall on the ceiling I noticed he decided to put 3/8 instead of 5/8! He did most of the work himself and figured that 5/8 was too heavy for him to do alone. We ripped out all the lath and plaster so it's not going over anything. My question is when we put insulation back up in the attic will it cave the ceiling in? The joist are 24in on center and he already put it up...so its not like we can just take it back! What do I do? I'm freaking out here!